net/ax25/ax25_timer.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
   8  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   9  * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi)
  10  * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
  11  * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
  12  * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
  13  * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
  14  */
  15 #include <linux/config.h>
  16 #include <linux/errno.h>
  17 #include <linux/types.h>
  18 #include <linux/socket.h>
  19 #include <linux/in.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/timer.h>
  24 #include <linux/string.h>
  25 #include <linux/sockios.h>
  26 #include <linux/net.h>
  27 #include <net/ax25.h>
  28 #include <linux/inet.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/skbuff.h>
  31 #include <net/sock.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/system.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/mm.h>
  36 #include <linux/interrupt.h>
  37
  38 static void ax25_heartbeat_expiry(unsigned long);
  39 static void ax25_t1timer_expiry(unsigned long);
  40 static void ax25_t2timer_expiry(unsigned long);
  41 static void ax25_t3timer_expiry(unsigned long);
  42 static void ax25_idletimer_expiry(unsigned long);
  43
  44 void ax25_start_heartbeat(ax25_cb *ax25)
  45 {
  46         del_timer(&ax25->timer);
  47
  48         ax25->timer.data     = (unsigned long)ax25;
  49         ax25->timer.function = &ax25_heartbeat_expiry;
  50         ax25->timer.expires  = jiffies + 5 * HZ;
  51
  52         add_timer(&ax25->timer);
  53 }
  54
  55 void ax25_start_t1timer(ax25_cb *ax25)
  56 {
  57         del_timer(&ax25->t1timer);
  58
  59         ax25->t1timer.data     = (unsigned long)ax25;
  60         ax25->t1timer.function = &ax25_t1timer_expiry;
  61         ax25->t1timer.expires  = jiffies + ax25->t1;
  62
  63         add_timer(&ax25->t1timer);
  64 }
  65
  66 void ax25_start_t2timer(ax25_cb *ax25)
  67 {
  68         del_timer(&ax25->t2timer);
  69
  70         ax25->t2timer.data     = (unsigned long)ax25;
  71         ax25->t2timer.function = &ax25_t2timer_expiry;
  72         ax25->t2timer.expires  = jiffies + ax25->t2;
  73
  74         add_timer(&ax25->t2timer);
  75 }
  76
  77 void ax25_start_t3timer(ax25_cb *ax25)
  78 {
  79         del_timer(&ax25->t3timer);
  80
  81         if (ax25->t3 > 0) {
  82                 ax25->t3timer.data     = (unsigned long)ax25;
  83                 ax25->t3timer.function = &ax25_t3timer_expiry;
  84                 ax25->t3timer.expires  = jiffies + ax25->t3;
  85
  86                 add_timer(&ax25->t3timer);
  87         }
  88 }
  89
  90 void ax25_start_idletimer(ax25_cb *ax25)
  91 {
  92         del_timer(&ax25->idletimer);
  93
  94         if (ax25->idle > 0) {
  95                 ax25->idletimer.data     = (unsigned long)ax25;
  96                 ax25->idletimer.function = &ax25_idletimer_expiry;
  97                 ax25->idletimer.expires  = jiffies + ax25->idle;
  98
  99                 add_timer(&ax25->idletimer);
 100         }
 101 }
 102
 103 void ax25_stop_heartbeat(ax25_cb *ax25)
 104 {
 105         del_timer(&ax25->timer);
 106 }
 107
 108 void ax25_stop_t1timer(ax25_cb *ax25)
 109 {
 110         del_timer(&ax25->t1timer);
 111 }
 112
 113 void ax25_stop_t2timer(ax25_cb *ax25)
 114 {
 115         del_timer(&ax25->t2timer);
 116 }
 117
 118 void ax25_stop_t3timer(ax25_cb *ax25)
 119 {
 120         del_timer(&ax25->t3timer);
 121 }
 122
 123 void ax25_stop_idletimer(ax25_cb *ax25)
 124 {
 125         del_timer(&ax25->idletimer);
 126 }
 127
 128 int ax25_t1timer_running(ax25_cb *ax25)
 129 {
 130         return timer_pending(&ax25->t1timer);
 131 }
 132
 133 unsigned long ax25_display_timer(struct timer_list *timer)
 134 {
 135         if (!timer_pending(timer))
 136                 return 0;
 137
 138         return timer->expires - jiffies;
 139 }
 140
 141 EXPORT_SYMBOL(ax25_display_timer);
 142
 143 static void ax25_heartbeat_expiry(unsigned long param)
 144 {
 145         int proto = AX25_PROTO_STD_SIMPLEX;
 146         ax25_cb *ax25 = (ax25_cb *)param;
 147
 148         if (ax25->ax25_dev)
 149                 proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
 150
 151         switch (proto) {
 152         case AX25_PROTO_STD_SIMPLEX:
 153         case AX25_PROTO_STD_DUPLEX:
 154                 ax25_std_heartbeat_expiry(ax25);
 155                 break;
 156
 157 #ifdef CONFIG_AX25_DAMA_SLAVE
 158         case AX25_PROTO_DAMA_SLAVE:
 159                 if (ax25->ax25_dev->dama.slave)
 160                         ax25_ds_heartbeat_expiry(ax25);
 161                 else
 162                         ax25_std_heartbeat_expiry(ax25);
 163                 break;
 164 #endif
 165         }
 166 }
 167
 168 static void ax25_t1timer_expiry(unsigned long param)
 169 {
 170         ax25_cb *ax25 = (ax25_cb *)param;
 171
 172         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 173         case AX25_PROTO_STD_SIMPLEX:
 174         case AX25_PROTO_STD_DUPLEX:
 175                 ax25_std_t1timer_expiry(ax25);
 176                 break;
 177
 178 #ifdef CONFIG_AX25_DAMA_SLAVE
 179         case AX25_PROTO_DAMA_SLAVE:
 180                 if (!ax25->ax25_dev->dama.slave)
 181                         ax25_std_t1timer_expiry(ax25);
 182                 break;
 183 #endif
 184         }
 185 }
 186
 187 static void ax25_t2timer_expiry(unsigned long param)
 188 {
 189         ax25_cb *ax25 = (ax25_cb *)param;
 190
 191         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 192         case AX25_PROTO_STD_SIMPLEX:
 193         case AX25_PROTO_STD_DUPLEX:
 194                 ax25_std_t2timer_expiry(ax25);
 195                 break;
 196
 197 #ifdef CONFIG_AX25_DAMA_SLAVE
 198         case AX25_PROTO_DAMA_SLAVE:
 199                 if (!ax25->ax25_dev->dama.slave)
 200                         ax25_std_t2timer_expiry(ax25);
 201                 break;
 202 #endif
 203         }
 204 }
 205
 206 static void ax25_t3timer_expiry(unsigned long param)
 207 {
 208         ax25_cb *ax25 = (ax25_cb *)param;
 209
 210         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 211         case AX25_PROTO_STD_SIMPLEX:
 212         case AX25_PROTO_STD_DUPLEX:
 213                 ax25_std_t3timer_expiry(ax25);
 214                 break;
 215
 216 #ifdef CONFIG_AX25_DAMA_SLAVE
 217         case AX25_PROTO_DAMA_SLAVE:
 218                 if (ax25->ax25_dev->dama.slave)
 219                         ax25_ds_t3timer_expiry(ax25);
 220                 else
 221                         ax25_std_t3timer_expiry(ax25);
 222                 break;
 223 #endif
 224         }
 225 }
 226
 227 static void ax25_idletimer_expiry(unsigned long param)
 228 {
 229         ax25_cb *ax25 = (ax25_cb *)param;
 230
 231         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 232         case AX25_PROTO_STD_SIMPLEX:
 233         case AX25_PROTO_STD_DUPLEX:
 234                 ax25_std_idletimer_expiry(ax25);
 235                 break;
 236
 237 #ifdef CONFIG_AX25_DAMA_SLAVE
 238         case AX25_PROTO_DAMA_SLAVE:
 239                 if (ax25->ax25_dev->dama.slave)
 240                         ax25_ds_idletimer_expiry(ax25);
 241                 else
 242                         ax25_std_idletimer_expiry(ax25);
 243                 break;
 244 #endif
 245         }
 246 }